Tag: units - definitions and systems

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Questions Related to units - definitions and systems

Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

State whether true or false.
The measure of an angle is dependent upon the unit of length.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Plane angle is defined as the ratio of arc length to the radius.
Plane angle   $\theta = \dfrac{l}{r}$
So, the measure of an angle is dependent upon the unit of length. Thus, the given statement is true.
Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

What is number of significant figures in $0.310\times 103$ ?

  1. 2

  2. 3

  3. 4

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since the numbers $0.310$ and $103$ have 3 significant figures each. In the case of the multiplication, the maximum number of significant figures is the same as that of the number of significant figures in decimal number., so the final answer must also have 3 significant figures.